Fresh universal project does not 'sencha app refresh'

I created a simple app and am trying to refresh the bootstrap using sencha app refresh. When I do it fails on the theme. When I add toolkit: 'classic' to the app.json it does work. But that kind of defeats the purpose of a universal app.

Even on a newly created project without any changes this does not work.

Code:

---

>sencha generate app FooBar /tmp/foobar

>cd /tmp/foobar

>sencha app refresh

Sencha Cmd v6.0.0.92

[WRN] Failed to resolve package theme-neptune

[ERR] Theme "theme-neptune" not found

[ERR] Required package "theme-neptune" not found

---

PS. I am trying to refresh to load in dependencies in an ExtJS package

Fresh universal project does not 'sencha app refresh'